Just because your photos are encrypted, it doesn’t seem that you can count on them to be totally unreadable to someone without the key. The attack only seems to work against bitmap images, so those secret JPGs, PNGs, and GIFs should be safe for now. This is because most types of files contain significantly more entropy than bitmaps. That is to say, there is a lot more redundant information in a BMP file than there is in something compressed. Even in the case of the vulnerable images, the technique can only produce “the outline of a high-contrast image.”
Once again, it proves the statement that ‘you can’t hide secrets from the future with math.’ Cryptographic attacks – and the resources available to attackers – will only keep increasing over time.